computer analysis question

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Avatar of intrepid77

After a game you run the computer analysis. Then it tells you a summary of great moves, blunders etc. at the top of the analysis before it goes move by move. At the end of the top summary is says. Avg Diff 1.67 or whatever number for both players. wondering what Avg Diff means and how to interpret it. Thanks

Avatar of exactly20character

Something to do with material